import time
scale = 10
print('------执行开始------')
for i in range(scale+1):
    a = '*' * i
    b = '.' * (scale-i)
    c = (i/scale)*100
    print('{:^3.0f}%[{}->{}]'.format(c,a,b))
    time.sleep(0.1)
print('------执行结束------')